Abstract
By the use of the method of circulating oiling in which lubricating oil is supplied and discharged from the back and the front of the bearings, the tapered roller bearings of 32211, 32216, and 32220 have been tested for their frictional moment and temperature rise under the following conditions. Rotational speed =3 000-15 000 rpm (dn 165000-1 100 000), thrust load =500-2 000 kgf, the amount of lubricating oil =0. 87-6. 96 kg/min, lubricating oil temperature =40-85°C. As the result, the following estimated formula is obtained.M=2. 7 × 10-3P ·dm0.65+1. 6 × 10-2ZB0.45 · Q0.4 · N0.4· dmM= frictional moment, kgf · cm, P= thrust load, kgf, dm=average bearing diameter, cm, ZB = oil viscosity at bearing temperature, cP, Q = the amount of lubricating oil, kg/min, N= rotational speed, rpm.θB-θI=7. 3 × 10-4 ZI0.3·P0.2·Q-0.4 · N0.85· dm.θB =bearing temperature, °C, θI = lubricating oil temperature, °C, ZI =lubricating oil viscosity, cP.
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